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Old 2016-03-22, 19:17   #1772
amphoria
 
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You wait around for ages for a prime ... and then 3 come along at once!

4063*2^2309263-1 (695162 digits)
4063*2^2310187-1 (695440 digits)
4063*2^2313843-1 (696540 digits)
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Old 2016-03-22, 19:33   #1773
pepi37
 
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Dec 2011
After milion nines:)

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Quote:
Originally Posted by amphoria View Post
You wait around for ages for a prime ... and then 3 come along at once!

4063*2^2309263-1 (695162 digits)
4063*2^2310187-1 (695440 digits)
4063*2^2313843-1 (696540 digits)
This is closest triplet of primes in row I know!
Congratulations!
And in average you wait about 10 days between primes, not ages :)
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Old 2016-03-25, 19:23   #1774
amphoria
 
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Quote:
Originally Posted by pepi37 View Post
This is closest triplet of primes in row I know!
Congratulations!
And in average you wait about 10 days between primes, not ages :)
The reference was intended to be for k=4063 where the last prime was for n=738843, although in reality I was just stealing the saying about buses (at least in the UK).
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Old 2016-03-25, 20:35   #1775
pepi37
 
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After milion nines:)

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Quote:
Originally Posted by amphoria View Post
The reference was intended to be for k=4063 where the last prime was for n=738843, although in reality I was just stealing the saying about buses (at least in the UK).
So in whole world situation for buses is same: you wait it for ages ( or at least 10 days)
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Old 2016-04-09, 06:35   #1776
pinhodecarlos
 
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143*2^2007888-1 is prime! (604437 decimal digits) Time : 1351.837 sec. from SMD.
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Old 2016-04-14, 01:43   #1777
VBCurtis
 
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13*23527315-1. 1061829 digits.
That's 3 over 3M for k=13, and 5 over 2M!
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Old 2016-04-14, 10:17   #1778
paulunderwood
 
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Quote:
Originally Posted by VBCurtis View Post
13*23527315-1. 1061829 digits.
That's 3 over 3M for k=13, and 5 over 2M!
Congrats
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Old 2016-04-15, 06:47   #1779
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Quote:
Originally Posted by paulunderwood View Post
Congrats


:chicken:

:rainbow:

:fireworks:

How do you do these things?

How to find a prime like the one above except 52*3^n+/-1, or some other k. b = 2 to 16 (the bases)

Last fiddled with by PawnProver44 on 2016-04-15 at 06:52
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Old 2016-04-15, 11:52   #1780
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Quote:
Originally Posted by PawnProver44 View Post
How to find a prime like the one above except 52*3^n+/-1, or some other k. b = 2 to 16 (the bases)
Efficiently, you sieve, then you use LLR. I am not sure about which sieve to use

If you are bent on finding a mega-prime, start with testing those.

(mods please feel free to detach this sub-thread)
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Old 2016-04-22, 12:53   #1781
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4161*2^2240358-1 (674419 digits)
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Old 2016-04-26, 11:29   #1782
amphoria
 
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4161*2^2326875-1 (700463 digits)
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